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1 | C:\Merge Test Files\8.0.47\java\org\apache\catalina\comet | CometFilter.java | Fri Sep 29 16:53:28 2017 UTC |
2 | Mon Nov 20 14:16:17 2017 UTC |
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1 | /* | |||||
2 | * License d to the A pache Soft ware Found ation (ASF ) under on e or more | |||||
3 | * contrib utor licen se agreeme nts. See the NOTICE file dist ributed wi th | |||||
4 | * this wo rk for add itional in formation regarding copyright ownership. | |||||
5 | * The ASF licenses this file to You und er the Apa che Licens e, Version 2.0 | |||||
6 | * (the "L icense"); you may no t use this file exce pt in comp liance wit h | |||||
7 | * the Lic ense. You may obtai n a copy o f the Lice nse at | |||||
8 | * | |||||
9 | * ht tp://www.a pache.org/ licenses/L ICENSE-2.0 | |||||
10 | * | |||||
11 | * Unless required b y applicab le law or agreed to in writing , software | |||||
12 | * distrib uted under the Licen se is dist ributed on an "AS IS " BASIS, | |||||
13 | * WITHOUT WARRANTIE S OR CONDI TIONS OF A NY KIND, e ither expr ess or imp lied. | |||||
14 | * See the License f or the spe cific lang uage gover ning permi ssions and | |||||
15 | * limitat ions under the Licen se. | |||||
16 | */ | |||||
17 | ||||||
18 | ||||||
19 | package or g.apache.c atalina.co met; | |||||
20 | ||||||
21 | import jav a.io.IOExc eption; | |||||
22 | ||||||
23 | import jav ax.servlet .Filter; | |||||
24 | import jav ax.servlet .ServletEx ception; | |||||
25 | ||||||
26 | /** | |||||
27 | * A Comet filter, s imilar to regular fi lters, per forms filt ering task s on eithe r | |||||
28 | * the req uest to a resource ( a Comet se rvlet), or on the re sponse fro m a resour ce, or bot h. | |||||
29 | * <br><br > | |||||
30 | * Filters perform f iltering i n the <cod e>doFilter Event</cod e> method. Every Fil ter has ac cess to | |||||
31 | * a Filte rConfig ob ject from which it c an obtain its initia lization p arameters, a | |||||
32 | * referen ce to the ServletCon text which it can us e, for exa mple, to l oad resour ces | |||||
33 | * needed for filter ing tasks. | |||||
34 | * <p> | |||||
35 | * Filters are confi gured in t he deploym ent descri ptor of a web applic ation | |||||
36 | * <p> | |||||
37 | * Example s that hav e been ide ntified fo r this des ign are<br > | |||||
38 | * 1) Auth entication Filters < br> | |||||
39 | * 2) Logg ing and Au diting Fil ters <br> | |||||
40 | * 3) Imag e conversi on Filters <br> | |||||
41 | * 4) Data compressi on Filters <br> | |||||
42 | * 5) Encr yption Fil ters <br> | |||||
43 | * 6) Toke nizing Fil ters <br> | |||||
44 | * 7) Filt ers that t rigger res ource acce ss events <br> | |||||
45 | * 8) XSL/ T filters <br> | |||||
46 | * 9) Mime -type chai n Filter < br> | |||||
47 | * <br> | |||||
48 | * | |||||
49 | * @author Remy Mauc herat | |||||
50 | */ | |||||
51 | public int erface Com etFilter e xtends Fil ter { | |||||
52 | ||||||
53 | ||||||
54 | /** | |||||
55 | * The <code>doF ilterEvent </code> me thod of th e CometFil ter is cal led by the container | |||||
56 | * eac h time a r equest/res ponse pair is passed through t he chain d ue | |||||
57 | * to a client e vent for a resource at the end of the ch ain. The C ometFilter Chain pass ed in to t his | |||||
58 | * met hod allows the Filte r to pass on the eve nt to the next entit y in the | |||||
59 | * cha in.<p> | |||||
60 | * A t ypical imp lementatio n of this method wou ld follow the follow ing patter n:- <br> | |||||
61 | * 1. Examine th e request< br> | |||||
62 | * 2. Optionally wrap the request ob ject conta ined in th e event wi th a custo m implemen tation to | |||||
63 | * fil ter conten t or heade rs for inp ut filteri ng and pas s a CometE vent insta nce contai ning | |||||
64 | * the wrapped r equest to the next f ilter<br> | |||||
65 | * 3. Optionally wrap the response o bject cont ained in t he event w ith a cust om impleme ntation to | |||||
66 | * fil ter conten t or heade rs for out put filter ing and pa ss a Comet Event inst ance conta ining | |||||
67 | * the wrapped r equest to the next f ilter<br> | |||||
68 | * 4. a) <strong >Either</s trong> inv oke the ne xt entity in the cha in using t he CometFi lterChain object (<c ode>chain. doFilterEv ent()</cod e>), <br> | |||||
69 | * 4. b) <strong >or</stron g> not pas s on the r equest/res ponse pair to the ne xt entity in the fil ter chain to block t he event p rocessing< br> | |||||
70 | * 5. Directly s et fields on the res ponse afte r invocati on of the next entit y in the f ilter chai n. | |||||
71 | * | |||||
72 | * @pa ram event the event that is be ing proces sed. Anoth er event m ay be pass ed along t he chain. | |||||
73 | * @pa ram chain | |||||
74 | * @th rows IOExc eption | |||||
75 | * @th rows Servl etExceptio n | |||||
76 | */ | |||||
77 | public void doFi lterEvent( CometEvent event, Co metFilterC hain chain ) | |||||
78 | th rows IOExc eption, Se rvletExcep tion; | |||||
79 | ||||||
80 | ||||||
81 | } |
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